Augustus h



1w Model.)

A. H.. JONES.

LAMP.

No. 246,316. w v Patented Aug. 30,1881..

T f q if Z t *AFWLI i a 1 h lJ hfn/lcat .Jlzylldfzafif -7/ w -e-n NrrEDSTATES PATENT OFFICEQ AUGUSTUS H. JONES, OF MERIDEN, CONNECTICUT,ASSIGNCR TO THE BRAD- LEY 8t HUBBARD MANUFACTURING COMPANY, OF SAMEPLACE.

LAMP.

SPECIFICATION forming part of Letters Patent No. 246,316, dated August30, 1881.

Application filed May 12, 1881. (No model.)

To all whom it may concern:

Be it known that I, AUGUSTUS H. JONES, of Meriden, in the county of NewHaven and State of Connecticut, have invented a new Improvemeut inLamps; and I do hereby declare the following, when taken in connectionwith the accompanying drawing, and the letters of reference markedthereon, to be a full, clear, and exact description of the same, andwhich 10 said drawing constitutes part of this specification andrepresents a sectional side View.

This invention relates to an improvement in. that class of lampscommonly called student or study lampsthat is to say, that class oflamps which have a fount with a conductor leading therefrom to awick-holder outside the fountthe object being to prevent the overflow ofoil by removing the pressure of the oil in the fount from the flow tothe wick; and the invention consists in the construction as hereinafterdescribed, and particularly recited in the claims. As represented in thedrawing, the arrangement is similar to the studentlamps, but it will beunderstood that it may 2 5 be applied to brackets and to chandeliers.

A represents the usual standard, on which a socket, B, is madeadjustable, secured at any desirable elevation by a set-screw, C.

D is the wick-chamber, of the usual construction, to which oil issupplied through a horizontal tube, E.

F is the fount, preferably made from glass. Centrally at the bottom is achamber, a, opening from the fount through a passage, 1), in-

3 5 which is a valve, cl, preferably of conical shape, and thepassage 1) also of conical shape, so that the valve may be raised toclose the passage or lowered to open the passage to the required extent.The chamber a communicates directly through the tube E with thewick-chamber.

At the top of the fount a neck, G, is constructed, preferably directlyover the chamber a below-that is, centrally on the fount. This neckforms the opening through which the fount 4 5 is filled, and is tightlyclosed by the screw-plug H. From the valve (1 a small tube, 6, extendsup to the plug H, and is fitted so as to set close and tight against thelower end of the plug, and through the plug is an air-passage, f,communicating directly with the tube 6. Below the valve is a spring, h,tending to force the valve upward, and so as to hold the upper end ofthe tube 6 close against the plug, the upper end of the tube supportedin a guide, '5, so as to retain it in its central position, the guidebeing an open bridge, through which the oil will pass when poured intothe fount. In order to insure a close joint between the end of the tubea and the-plug H, a packing, m, may be introduced. On the tube e nearthe bottom of the fount an opening, a, is made, so that communication isopen between the tube and the fount at that point. The plug H may beadjusted so as to make the passage 12 of the required size for thesupply of oil to the burner. 6 5

To fill the fount, remove the plug H. The valved rises as the plugrisesand closes the pasage h,to preven t the oil from flowing through thepassage 12 to the chamber below. The fount is then filled, and should bevery nearly full, or so as to leave only space sufficient for thenatural expansion of the oil. When so filled the plug H is replaced andscrewed down to prevent the possibility of air entering the fountbetween the plug and neck. Screwing down the plug also forces down thevalve cl and opens the passage b. The oil will, of course, stand in thetube 6 on a level with that in the fount, because the tube 6 is open tothe atmosphere. As the oil is consumed it will fall in the fount only toa very slight extent, because no air is admitted at the top of thefount. When the level of the oil in the fount has fallen so far as itcan do without the admission of air above it, the

oil will freely flow from the tube 0 until the level in the tube comesbelow the top of the opening n,- then a small quantity of air will bepermitted to pass down the tube e through the opening n into the body ofoil, whence it passes to the space above. This slight admission of 0 airrelieves the oil.. It falls, and in so doing refills the tube 0 to theextent which the ad mitted air will permit, and at which time thefurther fall of oil is arrested; then the oil again flows from the tube6. After the flow has com- 5 menced the only pressure upon-the oil inthe burner is that of the column within the tube, and never so great asto possibly cause an over flow.

The filler may be independent of the neck :00

within which the plug H is inserted; or the airtube 6 may bestationary-that is, not adjustable or movable within the fount, and thevalve closed by direct connection with the fillingplug or otherwise. Infact, when the lamp is in operation the tube 0 is a stationary tube, itbeing movable only to the extent that it acts as a rod to open and closethe valve (1.

I claim 1. A lamp-fount constructed with a passage through its bottom toa chamber below, which communicates with the wickchamber, combined witha valve arranged to close said passage, a tube attached to said valve,and extending to a removable plug at the top and opening to theatmosphere, and also opening to the fount near the bottom substantiallyas described.

AUGUSTUS H. JONES.

\Vitnesses F. J. SeIDENsTIoKEn, CHAS. E. SHELLEY.

